Many thanks for the description. It's very interesting that you went through the whole reason test complex. I have i7 7820x, after OC 19990 points in the passmark and I reach 56 seconds in this complex test. The remaining specification is comparable to yours. With the fact that it's great if you carried out the test on Tascam US2x2 drivers (preferably with 1024samples latency in Reason audio preferences). The control surface is unlikely to affect the test.
You have a very strong single core processor, I wonder if this determines such a huge performance. Your 3038 to 2489 in my single thread processor. That's 20% more.

As jam-s suggested I was running with CPU limit at none. Setting it 95% made a difference. I will try running out to the Tascam when I get a chance and see if that changes anything.

Of course you do - under Reason’s Preferences. And there should be an option under your motherboard BIOS if you want to turn it off for Windows (which I don’t recommend).

The 9700k doesn't run HT, just 8 straight cores. It is a slightly slower 9900k with HT turned off and less L3 cache. I picked it because it was about 150 cheaper than the 9900k at the time and I feel slightly less vulnerable to side channel attacks. Probably just a pipe dream and I probably should have sucked it up and picked the 9900.